JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrap">
    
    <a href="#" class="link">Open</a>
    <a href="#" class="close">Close_OFF</a>
    
    <div class="popup-wrapp"></div>
    <div class="myblok">
        
    </div>
    
    
</div>

CSS

* {
    margin: 0;
    padding: 0;
}

html,body {
    width: 100%;
    height: 100%;
    background-color: #cccccc;
}

.wrap {
    width: 800px;
    height: 100%;
    margin: 0 auto;
    overflow: hidden;
    background-color: #313131;
}

.close,
.link {
    background-color: #fa9100;
    border-radius: 10px;
    color: #fff;
    display: block;
    font: italic bold 16px "Arial";
    width: 100px;
    height: 30px;
    text-align: center;
    text-decoration: none;
    padding-top: 10px;
    margin-bottom: 10px !important;
    margin: 0 auto;
    position: relative;
    top: 55px;
}

.link:hover {
    background-color:#D9D900;
}
.popup-wrapp{
    position:fixed;
    z-index: 10;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    background: #000;
    display: none;
}
.myblok {
    width: 150px;
    height: 150px;
    background-color: #22FF00;
    margin: 0 auto;
    position: absolute;
    clear: both;
    top: 100px;
    left: 50%;
    top: 50%;
    margin-top: -75px;
    margin-left: -75px;
    z-index: 999;
    display: none;
}

JavaScript

$(document).ready(function(){
    $('.link').on('click',function(){
        $('.popup-wrapp,.myblok').fadeIn(300);
    });
    $('.popup-wrapp').on('click',function(){
        $('.popup-wrapp,.myblok').fadeOut(300);
    });
});